function positionInfo(object) {

    var p_elm = object;

    this.getElementLeft = getElementLeft;
    function getElementLeft() {
        var x = 0;
        var elm;
        if(typeof(p_elm) == "object"){
            elm = p_elm;
        } else {
            elm = document.getElementById(p_elm);
        }
        while (elm != null) {
            x+= elm.offsetLeft;
            elm = elm.offsetParent;
        }
        return parseInt(x);
    }

    this.getElementWidth = getElementWidth;
    function getElementWidth(){
        var elm;
        if(typeof(p_elm) == "object"){
            elm = p_elm;
        } else {
            elm = document.getElementById(p_elm);
        }
        return parseInt(elm.offsetWidth);
    }

    this.getElementRight = getElementRight;
    function getElementRight(){
        return getElementLeft(p_elm) + getElementWidth(p_elm);
    }

    this.getElementTop = getElementTop;
    function getElementTop() {
        var y = 0;
        var elm;
        if(typeof(p_elm) == "object"){
            elm = p_elm;
        } else {
            elm = document.getElementById(p_elm);
        }
        while (elm != null) {
            y+= elm.offsetTop;
            elm = elm.offsetParent;
        }
        return parseInt(y);
    }

    this.getElementHeight = getElementHeight;
    function getElementHeight(){
        var elm;
        if(typeof(p_elm) == "object"){
            elm = p_elm;
        } else {
            elm = document.getElementById(p_elm);
        }
        return parseInt(elm.offsetHeight);
    }

    this.getElementBottom = getElementBottom;
    function getElementBottom(){
        return getElementTop(p_elm) + getElementHeight(p_elm);
    }
}

function CalendarControl() {

    var calendarId = 'CalendarControl';
    var currentYear = 0;
    var currentMonth = 0;
    var currentDay = 0;

    var selectedYear = 0;
    var selectedMonth = 0;
    var selectedDay = 0;

    var months = ['January','February','March','April','May','June','July','August','September','October','November','December'];
    var dateField = null;

    function getProperty(p_property){
        var p_elm = calendarId;
        var elm = null;

        if(typeof(p_elm) == "object"){
            elm = p_elm;
        } else {
            elm = document.getElementById(p_elm);
        }
        if (elm != null){
            if(elm.style){
                elm = elm.style;
                if(elm[p_property]){
                    return elm[p_property];
                } else {
                    return null;
                }
            } else {
                return null;
            }
        }
    }

    function setElementProperty(p_property, p_value, p_elmId){
        var p_elm = p_elmId;
        var elm = null;

        if(typeof(p_elm) == "object"){
            elm = p_elm;
        } else {
            elm = document.getElementById(p_elm);
        }
        if((elm != null) && (elm.style != null)){
            elm = elm.style;
            elm[ p_property ] = p_value;
        }
    }

    function setProperty(p_property, p_value) {
        setElementProperty(p_property, p_value, calendarId);
    }

    function getDaysInMonth(year, month) {
        return [31,((!(year % 4 ) && ( (year % 100 ) || !( year % 400 ) ))?29:28),31,30,31,30,31,31,30,31,30,31][month-1];
    }

    function getDayOfWeek(year, month, day) {
        var date = new Date(year,month-1,day)
        return date.getDay();
    }

    this.clearDate = clearDate;
    function clearDate() {
        dateField.value = '';
        hide();
    }

    this.setDate = setDate;
    function setDate(year, month, day) {
        var dateString;
        if (dateField) {
            if (month < 10) {
                month = "0" + month;
            }
            if (day < 10) {
                day = "0" + day;
            }

            dateString = year+"-"+month+"-"+day;
            dateField.value = dateString;
            hide();
        }
    
        //alert("hej: "+dateString+"value: "+document.getElementById(calendarId).value);
    
        return dateString;
    }
  
    this.changeMonth = changeMonth;
    function changeMonth(change) {
        currentMonth += change;
        currentDay = 0;
        if(currentMonth > 12) {
            currentMonth = 1;
            currentYear++;
        } else if(currentMonth < 1) {
            currentMonth = 12;
            currentYear--;
        }

        calendar = document.getElementById(calendarId);
        calendar.innerHTML = calendarDrawTable();
    }

    this.changeYear = changeYear;
    function changeYear(change) {
        currentYear += change;
        currentDay = 0;
        calendar = document.getElementById(calendarId);
        calendar.innerHTML = calendarDrawTable();
    }

    function getCurrentYear() {
        var year = new Date().getYear();
        if(year < 1900) year += 1900;
        return year;
    }

    function getCurrentMonth() {
        return new Date().getMonth() + 1;
    }

    function getCurrentDay() {
        return new Date().getDate();
    }

    function calendarDrawTable() {

        var dayOfMonth = 1;
        var validDay = 0;
        var startDayOfWeek = getDayOfWeek(currentYear, currentMonth, dayOfMonth);
        var daysInMonth = getDaysInMonth(currentYear, currentMonth);
        var css_class = null; //CSS class for each day

        var table = "<table cellspacing='0' cellpadding='0' border='0'>";
        table = table + "<tr class='header'>";
        table = table + "  <td colspan='2' class='previous'><a href='javascript:changeCalendarControlMonth(-1);'>&lt;</a> <a href='javascript:changeCalendarControlYear(-1);'>&laquo;</a></td>";
        table = table + "  <td colspan='3' class='title'>" + months[currentMonth-1] + "<br>" + currentYear + "</td>";
        table = table + "  <td colspan='2' class='next'><a href='javascript:changeCalendarControlYear(1);'>&raquo;</a> <a href='javascript:changeCalendarControlMonth(1);'>&gt;</a></td>";
        table = table + "</tr>";
        table = table + "<tr><th>S</th><th>M</th><th>T</th><th>W</th><th>T</th><th>F</th><th>S</th></tr>";

        for(var week=0; week < 6; week++) {
            table = table + "<tr>";
            for(var dayOfWeek=0; dayOfWeek < 7; dayOfWeek++) {
                if(week == 0 && startDayOfWeek == dayOfWeek) {
                    validDay = 1;
                } else if (validDay == 1 && dayOfMonth > daysInMonth) {
                    validDay = 0;
                }

                if(validDay) {
                    if (dayOfMonth == selectedDay && currentYear == selectedYear && currentMonth == selectedMonth) {
                        css_class = 'current';
                    } else if (dayOfWeek == 0 || dayOfWeek == 6) {
                        css_class = 'weekend';
                    } else {
                        css_class = 'weekday';
                    }

                    table = table + "<td><a class='"+css_class+"' href=\"javascript:setCalendarControlDate("+currentYear+","+currentMonth+","+dayOfMonth+")\">"+dayOfMonth+"</a></td>";
                    dayOfMonth++;
                } else {
                    table = table + "<td class='empty'>&nbsp;</td>";
                }
            }
            table = table + "</tr>";
        }

        table = table + "<tr class='header'><th colspan='7' style='padding: 3px;'><a href='javascript:clearCalendarControl();'>Clear</a> | <a href='javascript:hideCalendarControl();'>Close</a></td></tr>";
        table = table + "</table>";

        return table;
    }

    this.show = show;
    function show(field) {
        can_hide = 0;
  
        // If the calendar is visible and associated with
        // this field do not do anything.
        if (dateField == field) {
            return;
        } else {
            dateField = field;
        }

        if(dateField) {
            try {
                var dateString = new String(dateField.value);
                var dateParts = dateString.split("-");
        
                selectedMonth = parseInt(dateParts[1],10);
                selectedDay = parseInt(dateParts[2],10);
                selectedYear = parseInt(dateParts[0],10);
            } catch(e) {}
        }

        if (!(selectedYear && selectedMonth && selectedDay)) {
            selectedMonth = getCurrentMonth();
            selectedDay = getCurrentDay();
            selectedYear = getCurrentYear();
        }

        currentMonth = selectedMonth;
        currentDay = selectedDay;
        currentYear = selectedYear;

        if(document.getElementById){

            calendar = document.getElementById(calendarId);
            calendar.innerHTML = calendarDrawTable(currentYear, currentMonth);

            setProperty('display', 'block');

            var fieldPos = new positionInfo(dateField);
            var calendarPos = new positionInfo(calendarId);

            var x = fieldPos.getElementLeft();
            var y = fieldPos.getElementBottom();

            setProperty('left', x + "px");
            setProperty('top', y + "px");
 
            if (document.all) {
                setElementProperty('display', 'block', 'CalendarControlIFrame');
                setElementProperty('left', x + "px", 'CalendarControlIFrame');
                setElementProperty('top', y + "px", 'CalendarControlIFrame');
                setElementProperty('width', calendarPos.getElementWidth() + "px", 'CalendarControlIFrame');
                setElementProperty('height', calendarPos.getElementHeight() + "px", 'CalendarControlIFrame');
            }
        }
    }

    this.hide = hide;
    function hide() {
        if(dateField) {
            setProperty('display', 'none');
            setElementProperty('display', 'none', 'CalendarControlIFrame');
            dateField = null;
        }
    }

    this.visible = visible;
    function visible() {
        return dateField
    }

    this.can_hide = can_hide;
    var can_hide = 0;
}

var calendarControl = new CalendarControl();
var elementName;
var AJAXRESPONSEFILE;
var table;
var columnID;
var elementValue;
var userid;


function showCalendarControl(element, tablef, columnIDf, rowIDf, filetoSend, user) {

    elementName=element.name;
    calendarControl.show(element);
    AJAXRESPONSEFILE=filetoSend;
    table=tablef;
    columnID=columnIDf;
    rowID=rowIDf;
    //alert("AJAX RESPONSE FILE:"+ AJAXRESPONSEFILE);
    userid=user;
  
}

//thisone is called from script find/findir.php
function showCalendarControlSearch(element) {

    elementName=element.name;
    calendarControl.show(element);
//alert(elementName);


}

function clearCalendarControl() {
    calendarControl.clearDate();
    AJAXRESPONSEFILE=null;
    table=null;
    columnID=null;
    rowID=null;
    userid=null;
  
//we want to call this function only if AJAXRESPONSEFILE==null
//so wo do not call it all the time when 
//function showCalendarControl(element, tablef, columnIDf, rowIDf, filetoSend)
//is called
//  if(AJAXRESPONSEFILE==null)
//  {setSearchVariables(elementName, null);}
//  elementValue=null;
//  elementName=null;
}

function hideCalendarControl() {
    if (calendarControl.visible()) {
        calendarControl.hide();
        elementName=null;
        AJAXRESPONSEFILE=null;
        table=null;
        columnID=null;
        rowID=null;
        elementValue=null;
        userid=null;
    }
}

function setCalendarControlDate(year, month, day) {
    var date = calendarControl.setDate(year, month, day);
    var elem = elementName;
    elem+="ajaxResp";
    //alert(elem+ "    value=");
    if(AJAXRESPONSEFILE!=null)
    {
        ajaxResponseDIRTDate(date, table, columnID, rowID, elem, AJAXRESPONSEFILE, userid);
    }
    else
    {//alert("not null elem:"+elem);
        setSearchVariables(elementName, date);
    }
  
}

function changeCalendarControlYear(change) {
    calendarControl.changeYear(change);
}

function changeCalendarControlMonth(change) {
    calendarControl.changeMonth(change);
}

document.write("<iframe id='CalendarControlIFrame' src='javascript:false;' frameBorder='0' scrolling='no'></iframe>");
document.write("<div id='CalendarControl'></div>");